Recent Evolution of Coastal Tidal Flats and the Impacts of Intensified Human Activities in the Modern Radial Sand Ridges, East China

Zhao, Yifei; Liu, Qing; Huang, Runqiu; Pan, Haichen; Xu, Min

doi:10.3390/ijerph17093191

Cited by 28 publications

(17 citation statements)

References 55 publications

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“…Since the Yellow River moved to the Bohai Sea due to natural destruction in 1855, the source of sediment from the Yellow River into the South Yellow Sea has been greatly reduced, and the hydrodynamic conditions of the Dongsha Shoal have changed [ 53 , 54 ]. As a result, the radial sand ridge has entered an unprecedented adjustment stage, causing severe ocean erosion and coastline retreat on the central coast of Jiangsu and the west side of the Dongsha Shoal [ 55 , 56 ]. This is also the driving force for the overall eastward migration of the sand ridge line.…”

Section: Discussionmentioning

confidence: 99%

Recent Evolution of the Intertidal Sand Ridge Lines of the Dongsha Shoal in the Modern Radial Sand Ridges, East China

Liu

Zhang

et al. 2021

IJERPH

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The Dongsha Shoal is one of the largest shoals in the South Yellow Sea and has important marine ecological value. The shoal extends in a south–north direction and is controlled by the regional dominating tidal currents. Recently, due to human activities and some natural factors, the geomorphic dynamics of the Dongsha Shoal has undergone drastic changes. However, few people have proposed quantitative research on the changes of tidal flat morphology, let alone the long-term sequence analysis of sand ridge lines. Hence, we attempt to take the Dongsha Shoal in the Radial Sand Ridges as the research area, and analyze the trends of the long-term morphological evolution of the sand ridge lines over the period 1973–2016 based on a high-density time series of medium-resolution satellite images. The sand ridge line generally moves from southeast to northwest, and the position distribution of the sand ridge line from north to south has gradually changed from compact to scattered. We also found that the geomorphological dynamics at different positions of the sand ridge line are inconsistent. The north and south wings are eroded on the west side, while the central area is eroded on the east side. Most of the sand ridge line is moving eastward. In addition, the change of sand ridge line is affected by multiple factors such as sediment supply, typhoon, reclamation and laver cultivation.

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Section: Discussionmentioning

confidence: 99%

Recent Evolution of the Intertidal Sand Ridge Lines of the Dongsha Shoal in the Modern Radial Sand Ridges, East China

Liu

Zhang

et al. 2021

IJERPH

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“…2 ) (Ma et al 2020 ; Wang et al 2020 ), and salt pans display obvious shape characteristics, mainly shaped as contiguously distributed and regular rectangles. eCognition9.0 can be used to extract the aspect ratios and rectangularity features of segmented objects; thus, texture features were also used during classification (Wang et al 2019a , b ; Zhao et al 2020 ). Based on these characteristic variables, according to the interpretation of each wetland type (Fig.…”

Section: Methodsmentioning

confidence: 99%

Reclamation and Ecological Service Value Evaluation of Coastal Wetlands Using Multispectral Satellite Imagery

Yan

et al. 2022

Wetlands

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There are special locational value and natural resources in coastal wetlands. Studying their changes and evaluating their ecosystem service value (ESV) is beneficial for protecting the ecology of coastal wetlands and for maintaining sustainable human development. In this paper, the coastal wetland of Jiaozhou Bay is selected as the research area, an object-oriented method is used to extract shoreline and wetland information, and the coastal wetland reclamation process in Jiaozhou Bay is evaluated. The value equivalent method and market value method are used to evaluate the service value of wetland ecosystems from the perspective of ecological economics. The results show that the reclamation area of Jiaozhou Bay reached 75.2 km 2 in 40 years, with nearly 23% of the bay area eroding. Reclamation engineering, estuary engineering, policy implementation and urbanization are the main factors affecting the changes in the Jiaozhou Bay wetland, and the main direction of wetland succession is natural wetlands→artificial wetlands→nonwetlands. Wetland reclamation in Jiaozhou Bay has led to the continuous extension of the coastline to the sea, especially during the 2005–2020 period, and the wetland area has declined in area by 116 km 2 . The changes in the wetland in the past 40 years have affected the changes in the ESV of Jiaozhou Bay, and there have been different synergistic/trade-off relationships in different periods. This research provides data to support the comprehensive ecological management of coastal areas, which is conducive to maximizing the utilization value of wetlands and promoting wetland protection.

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“…The coastal and estuarine tidal flats have mainly evolved into salt marsh wetlands under the dominant action of certain natural factors. Regional landscape diversity has increased, which has improved the antidisturbance ability of coastal estuarine wetland ecosystems (Cao et al, 2020;Liu et al, 2020;Zhao et al, 2020). However, tidal flats in coastal estuaries are an important element of the land reserve resources of coastal cities, and the evolution of this landscape has been deeply affected by human activities (Lin et al, 2018), which have intensified the evolution of natural tidal flats into diversified artificial landscapes (Zhang et al, 2022).…”

Section: The Evolution Of Estuarine Tidal Flats Landscapesmentioning

confidence: 99%

Landscape ecological risk assessment and driving mechanism of coastal estuarine tidal flats—A case study of the liaohe estuary wetlands

Guo

et al. 2022

Front. Environ. Sci.

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Estuarine tidal flats are located in the land-sea crisscross-sensitive zone. The degraded and shrinking state of major tidal flat landscapes weakens their ecological role in maintaining the safety of coastal wetlands in the world. However, little attention has been paid to tidal flat landscape evolution and ecological risks due to the tidal flats being located in the periphery of estuarine wetlands. This study was conducted in the tidal flats of the Liaohe estuary wetlands. The GIS spatial analysis and a transition matrix were combined to explore the tidal flat landscape evolution characteristics. The ecological risk faced by the tidal flats was evaluated by a landscape ecological risk model constructed by landscape indexes. The key driving factors and threshold values that affect the ecological risks were clarified using geographical detectors and regression analysis methods. The results showed that the tidal flats mainly evolved into a natural wetland before 2000 and rapidly changed into an artificial landscape between 2000 and 2010; the proportion of artificial landscapes then began to decline after 2010. Over the past 30 years, the landscape ecological risk in this area has generally been at a medium risk level. The ecological risk index showed a decreasing trend with the increases in landscape diversity. The low-risk artificial plaques have gradually replaced high-risk and medium-risk plaques of exposed tidal flats and natural wetlands. The study showed that human development activities were the key factors affecting the landscape ecological risks of the tidal flats. River sediment discharge was the key natural factor in maintaining the landscape ecological risk at a stable level. Therefore, the human development activities should be controlled within an appropriate limit, and the material supply of the upstream basin should be guaranteed to maintain the stability of the tidal flat landscape form in the protection and utilization of estuarine tidal flats in the future.

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Recent Evolution of Coastal Tidal Flats and the Impacts of Intensified Human Activities in the Modern Radial Sand Ridges, East China

Cited by 28 publications

References 55 publications

Recent Evolution of the Intertidal Sand Ridge Lines of the Dongsha Shoal in the Modern Radial Sand Ridges, East China

Recent Evolution of the Intertidal Sand Ridge Lines of the Dongsha Shoal in the Modern Radial Sand Ridges, East China

Reclamation and Ecological Service Value Evaluation of Coastal Wetlands Using Multispectral Satellite Imagery

Landscape ecological risk assessment and driving mechanism of coastal estuarine tidal flats—A case study of the liaohe estuary wetlands

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